Third party viewers such as Phoenix and Imprudence are equipped with many Windlight settings created by SL residents such as AnaLu, Caliah Lyon, CodeBastard Redgrave and Torley Linden. But they are not in Viewer 2! So I've added a few of my own, plus Strawberry Singh's Windlight settings for shadows and her Closeups effect (with no shadows). This works in the current Viewer 2 (version 2.1.1.208043).

Linux :

The folder that contains the "secondlife" boot script (for example, "~/Desktop/SecondLife-i686-1.21.6.99587/"). Its exact location depends on where you extracted the Viewer .bz2 archive after downloading it.

Restart SecondLife. You will find the new presets in World->Sun->Environment Editor Advanced Sky and Advanced Water